<template>
  <view class="goods-detail" v-if="goodsInfo.goods_name">
    <!-- 轮播图区域 -->
    <swiper :indicator-dots="true" indicator-active-color="#fff" :autoplay="true" :interval="3000" :duration="1000"
      circular>
      <swiper-item v-for="(item,i) in goodsInfo.pics" :key="i" @click="preview(i)">
        <image :src="item.pics_big" mode=""></image>
      </swiper-item>
    </swiper>

    <!-- 商品信息区域 -->
    <view class="goods-info-box">
      <!-- 价格 -->
      <view class="goods-price">￥{{goodsInfo.goods_price}}</view>
      <!-- 商品内容 -->
      <view class="goods-container">
        <view class="goods-name">
          {{goodsInfo.goods_name}}
        </view>
        <view class="right-box">
          <uni-icons type="star"></uni-icons>
          <text>收藏</text>
        </view>
      </view>

      <!-- 运费 -->
      <view class="yunfei">
        快递: 免运费 --{{cart.length}}
      </view>

      <!-- 商品详情信息 -->
      <rich-text :nodes="goodsInfo.goods_introduce"></rich-text>

      <!-- 商品导航区域 -->
      <view class="goods_nav">
        <!-- fill 控制右侧按钮的样式 -->
        <!-- options 左侧按钮的配置项 -->
        <!-- buttonGroup 右侧按钮的配置项 -->
        <!-- click 左侧按钮的点击事件处理函数 -->
        <!-- buttonClick 右侧按钮的点击事件处理函数 -->
        <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick" @buttonClick="buttonClick" />
      </view>
    </view>
  </view>
</template>

<script>
  import {
    mapState,
    mapMutations,
    mapGetters 
  } from 'vuex'
  export default {
    computed: {
        // 调用 mapState 方法，把 m_cart 模块中的 cart 数组映射到当前页面中，作为计算属性来使用
        // ...mapState('模块的名称', ['要映射的数据名称1', '要映射的数据名称2'])
        ...mapState('m_cart', ['cart']),
        ...mapGetters('m_cart',['total'])
      },
      watch:{
         // 1. 监听 total 值的变化，通过第一个形参得到变化后的新值
      total:{
        handler(newVal) {
          // 2. 通过数组的 find() 方法，找到购物车按钮的配置对象
          const findResult =  this.options.find(x => x.text ==='购物车')
            // 3. 动态为购物车按钮的 info 属性赋值
            console.log(newVal)
            if(findResult) {
              findResult.info = newVal
            }
        },
        // 页面加载后立即调用
        immediate: true
      }
      },
    data() {
      return {
        // 存放商品数据
        goodsInfo: {},
        // 底部商品导航配置对象
        options: [{
          icon: 'shop',
          text: '店铺',
          infoBackgroundColor: '#007aff',
          infoColor: "red"
        }, {
          icon: 'cart',
          text: '购物车',
          info: 0
        }],
        buttonGroup: [{
            text: '加入购物车',
            backgroundColor: '#ff0000',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: '#ffa200',
            color: '#fff'
          }
        ]
      };
    },

    onLoad(options) {
      console.log(options)
      this.getGoodsDetail(options.goods_id)
      console.log(this)
    },

    methods: {
        // 把 m_cart 模块中的 addCart 方法映射到当前页面使用
       ...mapMutations('m_cart',['addToCart']),
      // 获取商品详情
      async getGoodsDetail(goods_id) {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/detail', {
          goods_id
        })

        if (res.meta.status !== 200) return uni.$showMsg()

        // 解决图片底部空白间隙的问题
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display:block;" ').replace(
          /webp/g, 'jpg')
        this.goodsInfo = res.message
        console.log(res)
      },

      // 图片预览
      preview(i) {
        uni.previewImage({
          current: i,
          urls: this.goodsInfo.pics.map((x) => x.pics_big)
        })
      },
      // 左侧按钮的点击事件处理函数
      onClick(e) {
        console.log(e)
        if (e.content.text === '购物车') {
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      buttonClick(e) {
        console.log(e)
        // 判断是否点击了加入购物车按钮
        if(e.content.text === '加入购物车') {
          
          // 组织商品信息对象
          const goods = {
            goods_id: this.goodsInfo.goods_id,
            goods_name: this.goodsInfo.goods_name,
            goods_price: this.goodsInfo.goods_price,
            goods_count: 1,
            goods_small_logo: this.goodsInfo.goods_small_logo,
            goods_state: true
          }
          
          // 调用addCart方法
          this.addToCart(goods)
        }
      }
    }
  }
</script>

<style lang="scss">
  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }

  .goods-info-box {
    padding: 10px;

    .goods-price {
      color: #C00000;
      font-size: 18px;
      margin: 10px 0;
    }

    .goods-container {
      display: flex;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
        padding-right: 10px;
      }

      .right-box {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        border-left: 1px solid #efefef;
        color: gray;

        text {
          margin: 4rpx 0;
        }
      }
    }

    .yunfei {
      margin: 10px 0;
      font-size: 12px;
      color: gray;
    }
  }

  .goods-detail {
    padding-bottom: 50px;
  }

  .goods_nav {
    position: fixed;
    bottom: 0;

    width: 100%;
  }
</style>
